-97.4% is the change from 691 to 18
Calculation steps:
[( 18 - 691 ) ÷ 691] x 100 = -97.4%
Formula
Percentage change = [(18 - 691) / 691] x 100
Subtract the new number by the original number
18 - 691 = -673
-673 ÷ 691 = -0.9739507959479016
-0.9739507959479016 x 100 = -97.4%